(under the class definition) Device a) for plugging openings in the walls of treating or holding receptacles or b) for tapping such openings or otherwise removing plugs or other blockages therefrom.
(1) Note. Examples of apertures plugged by the sealing means are tuyere openings, cinder or slag notches, tap holes, etc.
SEE OR SEARCH THIS CLASS, SUBCLASS:
45, for process of opening or closing an aperture in the wall of a metallurgical vessel.
